// This code is derived from jcifs smb client library <jcifs at samba dot org>
// Ported by J. Arturo <webmaster at komodosoft dot net>
//  
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
using System;

namespace SharpCifs.Smb
{
    internal class SmbComWriteAndX : AndXServerMessageBlock
    {
        private static readonly int ReadAndxBatchLimit
            = Config.GetInt("jcifs.smb.client.WriteAndX.ReadAndX", 1);

        private static readonly int CloseBatchLimit
            = Config.GetInt("jcifs.smb.client.WriteAndX.Close", 1);

        private int _fid;

        private int _remaining;

        private int _dataLength;

        private int _dataOffset;

        private int _off;

        private byte[] _b;

        private long _offset;

        private int _pad;

        internal int WriteMode;

        public SmbComWriteAndX() : base(null)
        {
            Command = SmbComWriteAndx;
        }

        internal SmbComWriteAndX(int fid,
                                 long offset,
                                 int remaining,
                                 byte[] b,
                                 int off,
                                 int len,
                                 ServerMessageBlock andx) : base(andx)
        {
            this._fid = fid;
            this._offset = offset;
            this._remaining = remaining;
            this._b = b;
            this._off = off;
            _dataLength = len;
            Command = SmbComWriteAndx;
        }

        internal virtual void SetParam(int fid,
                                       long offset,
                                       int remaining,
                                       byte[] b,
                                       int off,
                                       int len)
        {
            this._fid = fid;
            this._offset = offset;
            this._remaining = remaining;
            this._b = b;
            this._off = off;
            _dataLength = len;
            Digest = null;
        }

        internal override int GetBatchLimit(byte command)
        {
            if (command == SmbComReadAndx)
            {
                return ReadAndxBatchLimit;
            }
            if (command == SmbComClose)
            {
                return CloseBatchLimit;
            }
            return 0;
        }

        internal override int WriteParameterWordsWireFormat(byte[] dst, int dstIndex)
        {
            int start = dstIndex;
            _dataOffset = (dstIndex - HeaderStart) + 26;
            // 26 = off from here to pad
            _pad = (_dataOffset - HeaderStart) % 4;
            _pad = _pad == 0 ? 0 : 4 - _pad;
            _dataOffset += _pad;
            WriteInt2(_fid, dst, dstIndex);
            dstIndex += 2;
            WriteInt4(_offset, dst, dstIndex);
            dstIndex += 4;
            for (int i = 0; i < 4; i++)
            {
                dst[dstIndex++] = 0xFF;
            }
            WriteInt2(WriteMode, dst, dstIndex);
            dstIndex += 2;
            WriteInt2(_remaining, dst, dstIndex);
            dstIndex += 2;
            dst[dstIndex++] = 0x00;
            dst[dstIndex++] = 0x00;
            WriteInt2(_dataLength, dst, dstIndex);
            dstIndex += 2;
            WriteInt2(_dataOffset, dst, dstIndex);
            dstIndex += 2;
            WriteInt4(_offset >> 32, dst, dstIndex);
            dstIndex += 4;
            return dstIndex - start;
        }

        internal override int WriteBytesWireFormat(byte[] dst, int dstIndex)
        {
            int start = dstIndex;
            while (_pad-- > 0)
            {
                dst[dstIndex++] = 0xEE;
            }
            Array.Copy(_b, _off, dst, dstIndex, _dataLength);
            dstIndex += _dataLength;
            return dstIndex - start;
        }

        internal override int ReadParameterWordsWireFormat(byte[] buffer, int bufferIndex)
        {
            return 0;
        }

        internal override int ReadBytesWireFormat(byte[] buffer, int bufferIndex)
        {
            return 0;
        }

        public override string ToString()
        {
            return "SmbComWriteAndX["
                        + base.ToString()
                        + ",fid=" + _fid
                        + ",offset=" + _offset
                        + ",writeMode=" + WriteMode
                        + ",remaining=" + _remaining
                        + ",dataLength=" + _dataLength
                        + ",dataOffset=" + _dataOffset + "]";
        }
    }
}
